228 
IOWA ACADEMY OF SCIENCES. 
Tall branching perennial, three to eight feet high, stem striate, 
smooth with age, few leaved, branches bearing few medium-sized 
heads with purple flowers; leaves deeply pinnatifid, divisions lanceo- 
late, the principal lobes somewhat spiny, upper surface slightly 
roughened, lower decidedly arachnoid, woolly when young, less so 
with age; heads one to one-fourth inches high, scales cf the invo- 
lucre closely appressed, cobwebby, outer with a broad base and a 
glutinous line on back, inner long acuminate, appendage with ser- 
rated margins, flowers purple, tube seven and one-half lines long, 
lobes three lines long, anthers with acute tips, appendage pubes- 
cent, filaments hairy, bristles of pappus of outer flowers barbellate, 
inner plumose, achenes one and three-fourths lines long, smooth. 
Distribution , Iowa . — Mason City, Forest City, Winne- 
bago county, Shimek. S. TJ. I. 
REFERENCE TO OCCURRENCE IN THE STATE. 
Arthur, Contr. FI. Ia. 1 : 20. 
CNICUS DISCOLOR, Muhl. 
Cnicus discolor. Muhl. Willd. Sp. 3:1670. 1804. 
Ell. Sk. 2 : 271. 
C. altissimus, var. discolor. Gray. Proc. Am. 
Acad. 1 : 40. 1884. 
Watson & Coulter. Gray's Man. 296. 1890. 
6 Ed. 
Cirsium discolor, Spreng. Syst. 3: 873. 1826. 
DeCandolle. Prodr. 6: 640. 1887. 
Torrey & Gray. FI. N. Am. 2: 457. 1843. 
Gray. Man. 273 1868. 5 Ed. 
Carduus discolor, Nutt. Gen. 2; 130. 1818. 
Britton & Brown. Illustr. FI. N. St. 3: 485. 
f. 4060. 1898. 
Serratula discolor, Poir. Diet. Enc. 6: 565. 
Tall, branching, leafy perennial, live to seven feet high, with 
heads larger than C. altissimus , stem striate, slightly hirsute; 
leaves radical, twelve to fourteen inches long, deeply pinnatitid, 
the divisions frequently divided, prickly toothed, the upper surface 
slightly hirsute, the lower woolly, stem leaves deeply pinnatifid, 
linear or linear-lanceolate with falcate segments, the larger twice 
or thrice cut, tipped with prickly spines, upper surface smoothish, 
the lower white, woolly; single heads terminating the branches, 
with purple flowers; heads one and one-half inches high; bracts of 
the globose involucre somewhat appressed, slightly arachnoid, 
